I have some duplicate plugins that I no longer use and want to delete (for example, two extra versions of the Smugmug publish plugin after I installed a newer one in a different folder, Nikon tether since I don't have Nikon, etc.). But the while the Add button is active, the Remove button is grayed out. I tried both enabled and disabled, but then I realized that Remove is grayed out for all the plugins.

I also tried opening the plugin to edit it. Then the Remove button is not grayed out, but while clicking it does break the connection, it doesn't remove the plugin.

Thanks for the suggestion. I was able to remove one of them from LR3, but alas even that one still shows up in LR4, as well as all the others. I just can't figure out why the "Remove" button is grayed out.

The idea is that only installers put plugins in 'Modules' folder, thus an un-installer should be used to un-install said plugin. If you don't have an un-installer for such plugins, you should tell the plugin supplier about it.

Likewise, if plugin is added by 'Add' button, it won't be in modules folder, and thus can be removed using 'Remove' button.